feat(消息气泡): 添加智能时间戳格式化功能

在消息气泡组件中实现智能时间显示逻辑，根据时间差显示"刚刚"、"X分钟前"、"昨天"等友好格式
同时添加中英文时间相关翻译字段

lib/core/translations/language/en_us.dart

@@ -893,4 +893,16 @@ const Map<String, String> enUS = {
   "乌尔都语": "Urdu",
   "波斯语": "Persian",
   "斯瓦希里语": "Swahili",
+
+  // Time related
+  "justNow": "Just now",
+  "minutesAgo": "@minutes minutes ago",
+  "yesterday": "Yesterday",
+  // "monday": "Monday",
+  // "tuesday": "Tuesday",
+  // "wednesday": "Wednesday",
+  // "thursday": "Thursday",
+  // "friday": "Friday",
+  // "saturday": "Saturday",
+  // "sunday": "Sunday",
 };

lib/core/translations/language/zh_cn.dart

@@ -824,4 +824,9 @@ const Map<String, String> zhCN = {
   "乌尔都语": "乌尔都语",
   "波斯语": "波斯语",
   "斯瓦希里语": "斯瓦希里语",
+
+  // 时间相关
+  "justNow": "刚刚",
+  "minutesAgo": "@minutes分钟前",
+  "yesterday": "昨天",
 };

lib/modules/agent/views/message_bubble.dart

@@ -33,8 +33,6 @@ class MessageBubble extends GetView<AgentController> {
 
   @override
   Widget build(BuildContext context) {
-    final timeFormat = DateFormat('HH:mm');
-
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 8),
       child: Row(
@@ -91,7 +89,7 @@ class MessageBubble extends GetView<AgentController> {
                     children: [
                       // 时间戳（左对齐或右对齐）
                       Text(
-                        timeFormat.format(timestamp),
+                        _formatTimestamp(timestamp),
                         style: TextStyle(
                           fontSize: 10,
                           color: Theme.of(context).brightness == Brightness.dark
@@ -105,7 +103,7 @@ class MessageBubble extends GetView<AgentController> {
                         Padding(
                           padding: const EdgeInsets.only(left: 8),
                           child: Text(
-                            "generatedByAi".tr,// 由AI生成
+                            "generatedByAi".tr, // 由AI生成
                             style: TextStyle(
                               fontSize: 8,
                               color: Colors.blue[600],
@@ -418,6 +416,77 @@ class MessageBubble extends GetView<AgentController> {
   Widget _buildDot(int milliseconds) {
     return _AnimatedDot(delayMilliseconds: milliseconds);
   }
+
+  /// 智能格式化时间戳
+  String _formatTimestamp(DateTime messageTime) {
+    final now = DateTime.now();
+    final today = DateTime(now.year, now.month, now.day);
+    final yesterday = today.subtract(const Duration(days: 1));
+    final messageDate =
+        DateTime(messageTime.year, messageTime.month, messageTime.day);
+
+    // 计算时间差
+    final difference = now.difference(messageTime);
+
+    // 1分钟内显示"刚刚"
+    if (difference.inMinutes < 1) {
+      return 'justNow'.tr; // 刚刚
+    }
+
+    // 1小时内显示"X分钟前"
+    if (difference.inHours < 1) {
+      return 'minutesAgo'
+          .trParams({'minutes': difference.inMinutes.toString()}); // X分钟前
+    }
+
+    // 今天的消息显示时间
+    if (messageDate == today) {
+      return DateFormat('HH:mm').format(messageTime);
+    }
+
+    // 昨天的消息显示"昨天 HH:mm"
+    if (messageDate == yesterday) {
+      return 'yesterday'.tr +
+          ' ' +
+          DateFormat('HH:mm').format(messageTime); // 昨天 HH:mm
+    }
+
+    // 本周内的消息显示"星期X HH:mm"
+    if (difference.inDays < 7) {
+      final weekday = _getWeekdayName(messageTime.weekday);
+      return weekday + ' ' + DateFormat('HH:mm').format(messageTime);
+    }
+
+    // 今年的消息显示"MM-dd HH:mm"
+    if (messageTime.year == now.year) {
+      return DateFormat('MM-dd HH:mm').format(messageTime);
+    }
+
+    // 其他情况显示完整日期"yyyy-MM-dd HH:mm"
+    return DateFormat('yyyy-MM-dd HH:mm').format(messageTime);
+  }
+
+  /// 获取星期名称
+  String _getWeekdayName(int weekday) {
+    switch (weekday) {
+      case 1:
+        return 'monday'.tr; // 星期一
+      case 2:
+        return 'tuesday'.tr; // 星期二
+      case 3:
+        return 'wednesday'.tr; // 星期三
+      case 4:
+        return 'thursday'.tr; // 星期四
+      case 5:
+        return 'friday'.tr; // 星期五
+      case 6:
+        return 'saturday'.tr; // 星期六
+      case 7:
+        return 'sunday'.tr; // 星期日
+      default:
+        return '';
+    }
+  }
 }
 
 /// 动画点组件